/*49IYa62ghE2tuE28NSCinuD7M6FQbdl38R1i+HVZfcI=*/
/**
 * Gzip流量压缩，使用pako.js实现
 */
import { gzip,inflate } from 'pako';

class Gzip {
    constructor() {
        this.base64EncodeChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
        this.base64DecodeChars = new Array(-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1, -1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1);
    }
   /**
         * Gzip压缩
         * @param str json字符串
         * @return 经过gzip压缩后转码为Base64的json字符串
         */
         zip(str){
            // if (localStorage.bGzipEnable == "N"){
            //     return str;
            // }
            if (str==undefined){
                return null;
            }
            var gstr;
            try{
                gstr = gzip(str);
            }catch (e){
                window.console.log(e);
                window.console.log("压缩报错：前台原始json"+str);
            }
             return this.encodeBase64(gstr);
        };

        /**
         * Gzip解压
         * @param str json字符串
         * @return js对象
         */
         unzip(str){
            // if (localStorage.bGzipEnable == "N"){
            //     return str;
            // }
            if (str==undefined){
                return null;
            }
            var gstr = this.decodeBase64(str);
            var out;
            try{
                out = inflate(gstr, { to: 'string' });
            }catch (e){
                window.console.log(e);
                window.console.log("解压报错--后台原始json:"+str);
                window.console.log("解压报错--前台解码后:"+gstr);
            }

            var strData = JSON.parse(out);
            return strData;
        };

        /**
         * 将二进制转为字符串
         * @param bytes 二进制字节流
         */
         encodeBase64(bytes){
            var out, i, len;
            var c1, c2, c3;
            len = bytes.length;
            i = 0;
            out = "";
            while (i < len) {
                c1 = bytes[i++] & 0xff;
                if (i == len) {
                    out += this.base64EncodeChars.charAt(c1 >> 2);
                    out += this.base64EncodeChars.charAt((c1 & 0x3) << 4);
                    out += "==";
                    break;
                }
                c2 = bytes[i++];
                if (i == len) {
                    out += this.base64EncodeChars.charAt(c1 >> 2);
                    out += this.base64EncodeChars.charAt(((c1 & 0x3) << 4) | ((c2 & 0xF0) >> 4));
                    out += this.base64EncodeChars.charAt((c2 & 0xF) << 2);
                    out += "=";
                    break;
                }
                c3 = bytes[i++];
                out += this.base64EncodeChars.charAt(c1 >> 2);
                out += this.base64EncodeChars.charAt(((c1 & 0x3) << 4) | ((c2 & 0xF0) >> 4));
                out += this.base64EncodeChars.charAt(((c2 & 0xF) << 2) | ((c3 & 0xC0) >> 6));
                out += this.base64EncodeChars.charAt(c3 & 0x3F);
            }
            return out;
        };

        /**
         * 将字符串转为二进制
         * @param str 字符串
         */
         decodeBase64(str){
            var c1, c2, c3, c4;
            var i, len, out;
            len = str.length;
            i = 0;
            out = "";
            while (i < len) {
                /* c1 */
                do {
                    c1 = this.base64DecodeChars[str.charCodeAt(i++) & 0xff];
                }
                while (i < len && c1 == -1);
                if (c1 == -1)
                    break;
                /* c2 */
                do {
                    c2 = this.base64DecodeChars[str.charCodeAt(i++) & 0xff];
                }
                while (i < len && c2 == -1);
                if (c2 == -1)
                    break;
                out += String.fromCharCode((c1 << 2) | ((c2 & 0x30) >> 4));
                /* c3 */
                do {
                    c3 = str.charCodeAt(i++) & 0xff;
                    if (c3 == 61)
                        return out;
                    c3 = this.base64DecodeChars[c3];
                }
                while (i < len && c3 == -1);
                if (c3 == -1)
                    break;
                out += String.fromCharCode(((c2 & 0XF) << 4) | ((c3 & 0x3C) >> 2));
                /* c4 */
                do {
                    c4 = str.charCodeAt(i++) & 0xff;
                    if (c4 == 61)
                        return out;
                    c4 = this.base64DecodeChars[c4];
                }
                while (i < len && c4 == -1);
                if (c4 == -1)
                    break;
                out += String.fromCharCode(((c3 & 0x03) << 6) | c4);
            }
            return out;
        };

  }
  export default Gzip;
/*49IYa62ghE2tuE28NSCinuD7M6FQbdl38R1i+HVZfcI=*/
